SX/SXi/SXi Pro Big bore cylinders

Hello... I'm goint to put 800 sx-r cylinders (modified by pjs) in my 750 sxi pro... cylinders need to be bored (big scrats on the other cylinder) so how big i can bore cylinders..? how well (and where) i can get big pistons..? and do i have to modified block..?

Thank you for helping me...

and sorry my bad english... =D
 
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